Specifications: Please double check whether you have regular mouth (2 3/8" internal diamter) or wide mouth (3" internal diameter) Mason jars! These can be little tricky to get on but if you have good manual dexterity, you should be able to get them on with just your fingers. The handle can be disconnected to put it around a branch, wire. See the second picture to see where to place the wire on the jar Fits these regular mouth jars under the glass bead or rim, which is the most secure location: Current Ball quarter pint, half pint, and pint jars. Current Kerr half pint and pint jars. Fits these regular mouth jars only on the threaded portion, which is still OK but not as secure: Current Ball quart jars. Current Kerr quart jars. Most other jars. Fits these wide mouth jars under the glass bead or rim, which is the most secure location: Current Ball pint jars. Current Kerr half pint and pint jars. Fits these wide mouth jars only on the top, threaded portion, which is still OK but not as secure: Current Ball pint & half, quart, and half gallon jars. Current Kerr quart jars. Most other jars.